DDR3 each frequency detailed

Recently looking at DDR3 's document, talking about the frequency of DDR3, I actually want to know in DDR3 's document, the lowest frequency definition is DDR3 800 (actually this frequency can be reduced, but the official recommended the lowest value only), I want to know how this 800 came, The following DRAM pin names are written according to DDR3 Spec, first we need to define several frequency concepts:

1, Core frequency cores frequence: According to the individual understanding should be on the DRAM pin clock (ck,ck#) frequency, if DDR3 clock is 200MHZ.

2, Working frequency work frequence: Because the DRAM works on the rising and falling edge of CK, a clock cycle transmits two data, that operating frequency = Core frequency X2=400mhz

3,DDR3 800: In addition we know that there is pre-reading technology, the technology is like a race, some people step by one meter, some people step two meters, so the speed of course is different, DDR 2bit pre-read, DDR2 4bit pre-read, DDR 3 8bit pre-read, so DDR3 800 = operating frequency x2= 800MHZ, at first I don't know why multiply 2, always think 8bit pre-reading should not be multiplied by 8? This is because I started with a bit to consider this problem, that actually we should be in byte units, DDR2 is 4bit pre-read, so just read half, DDR3 8bit pre-read equivalent to read one times, so should be multiplied by 2. Remember that it must be a byte unit.

DDR3 each frequency detailed